bibdrums
Probationary Member
- 13
- 0
- Apr 29, 2009
-
Milltown,
New_Jersey
1996 Gst spyder A/t, Hallman MBC, MHI big 16g, 3” turbo back exhaust, IPT retorqued converter, IPT shift kit, Autometer boost gauge, 20K on stock rebuild
About 6 months ago I was cruising on the highway doing about 70 when the car had a bad miss-fire and started feeling like it was running on 2 cylinders and sort of chugging. I pulled over and the car idled fine. So I gave it some gas and it sounded normal but was lacking a lot of power. It moved so slowly from a stop that it was hard to pull out into traffic. When I got home I checked for codes and had a p0300.
I have been chasing this problem for 6 months. Yesterday, out of nowhere, the car ran amazing for about an hour. Then, just as suddenly, it started running like crap again. Feels like it’s pulling timing or not getting enough/too much fuel. Also, the exhaust manifold is getting MUCH hotter than ever before. It melted the condenser fan. Builds boost very well though and holds it.
This is what I have checked or replaced:
Fixed ALL boost leaks
Checked timing (like 5 times)
Checked compression (all good)
New knock sensor (was leaking black goo)
Swapped in known good coils
New coolant temp sensor
Swapped in known good ECU
Turbo had play so had it rebuilt
Checked fuel pressure
New FPR
New egr
Salvaged power transistor
New alternator
Ran open exhaust to rule out catalytic converter
New O2 sensor
New exhaust manifold (was cracked and leaking)
New plugs ngk bpr6es gapped properly
New wires
New tps
New crank position sensor
New MAF
When I checked the fuel pressure it was a little high - 43 with the vacuum line connected and 50 disconnected, that’s why I changed the FPR but the new one is showing almost the same so it may be the gauge? Or a clogged return line maybe?
Does anyone have any other ideas on what to check next. I don’t have link, a wideband or anything to log with yet but I am getting link and a wideband in the next month or two. Does anyone have any ideas of stuff I may have missed in the meantime?
Thanks!
About 6 months ago I was cruising on the highway doing about 70 when the car had a bad miss-fire and started feeling like it was running on 2 cylinders and sort of chugging. I pulled over and the car idled fine. So I gave it some gas and it sounded normal but was lacking a lot of power. It moved so slowly from a stop that it was hard to pull out into traffic. When I got home I checked for codes and had a p0300.
I have been chasing this problem for 6 months. Yesterday, out of nowhere, the car ran amazing for about an hour. Then, just as suddenly, it started running like crap again. Feels like it’s pulling timing or not getting enough/too much fuel. Also, the exhaust manifold is getting MUCH hotter than ever before. It melted the condenser fan. Builds boost very well though and holds it.
This is what I have checked or replaced:
Fixed ALL boost leaks
Checked timing (like 5 times)
Checked compression (all good)
New knock sensor (was leaking black goo)
Swapped in known good coils
New coolant temp sensor
Swapped in known good ECU
Turbo had play so had it rebuilt
Checked fuel pressure
New FPR
New egr
Salvaged power transistor
New alternator
Ran open exhaust to rule out catalytic converter
New O2 sensor
New exhaust manifold (was cracked and leaking)
New plugs ngk bpr6es gapped properly
New wires
New tps
New crank position sensor
New MAF
When I checked the fuel pressure it was a little high - 43 with the vacuum line connected and 50 disconnected, that’s why I changed the FPR but the new one is showing almost the same so it may be the gauge? Or a clogged return line maybe?
Does anyone have any other ideas on what to check next. I don’t have link, a wideband or anything to log with yet but I am getting link and a wideband in the next month or two. Does anyone have any ideas of stuff I may have missed in the meantime?
Thanks!
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